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  1. or download this
    print "- " =~ /\s*\p{Dash}\s*/;    # 1
print "- " =~ /\s*\p{Dash}{1}\s*/; # 2
print "- " =~ /\s*-\s*/;           # 3
  2. or download this
    Compiling REx "\s*\p{Dash}\s*"
synthetic stclass "ANYOF[\11\12\14\15 ][{unicode_all}+utf8::Dash]".
...
Contradicts stclass... [regexec_flags]
Match failed
Freeing REx: "\s*\p{Dash}\s*"